From GDPR to CCPA, Apple Safari with their Intelligent Tracking Prevention and Mozilla Firefox Enhanced Tracking Prevention approach are all having a significant impact on data collection and how data is shared. 

All things consider, server-side tag management becomes an attractive option given these legislation changes and browsers taking control. 

Server-Side tag management involve running a Tag Management System like Google Tag Manager in your own and controlled web server. For GTM, the only available environment at this time is the Google Cloud Platform 

Are you interest to explore the use of server side tagging? My knowledge of Google Cloud Platform could helps you